iperf3: error - control socket has closed unexpectedly

Using iperf (v2) I get a correct answer about a slow connection in a 1GBit/s network from Manjaro to Xigmanas (NFS).

iperf 2.2.0-1
iperf 3.17.1

`System:
Kernel: 6.6.54-2-MANJARO arch: x86_64 bits
Desktop: GNOME v: 46.5 tk: GTK v: 3.24.43 wm: gnome-shell`

Complete System attached:
[System_complete.txt](https://github.com/user-attachments/files/17933522/System_complete.txt)

I tried several settings, but could not go out of the iperf3 error:

`[tom@tom-manjaro ~]$ iperf3 -c 192.168.0.43 -p 2049
iperf3: error - control socket has closed unexpectedly`

`[tom@tom-manjaro ~]$ iperf3 -c 192.168.0.43 -p 2049 -V
iperf 3.17.1
Linux tom-manjaro 6.6.54-2-MANJARO #1 SMP PREEMPT_DYNAMIC Tue Oct 8 03:11:08 UTC 2024 x86_64
Control connection MSS 1448
iperf3: error - control socket has closed unexpectedly`

`[tom@tom-manjaro ~]$ iperf -c 192.168.0.43 -p 2049
Client connecting to 192.168.0.43, TCP port 2049
TCP window size: 16.0 KByte (default)
[ 1] local 192.168.0.2 port 48904 connected with 192.168.0.43 port 2049
[ ID] Interval Transfer Bandwidth
[ 1] 0.0000-16.7145 sec 22.5 MBytes 11.3 Mbits/sec`

Any idea?